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#include <Wire.h> // I2C Arduino Library
#define address 0x1E // 0011110b, I2C 7bit address of HMC5883
void setup()
{
// initialize Serial and I2C communications
Serial.begin(9600);
Wire.begin();
// put the HMC5883 IC into the correct operating mode
Wire.beginTransmission(address); // open communication with HMC5883
Wire.write(0x02); // select mode register
Wire.write(0x00); // continuous measurement mode
Wire.endTransmission();
}
void loop()
{
int x, y, z; // triple axis data
// tell the HMC5883 where to begin reading data
Wire.beginTransmission(address);
Wire.write(0x03); // select register 3, X MSB register
Wire.endTransmission();
// read data from each axis, 2 registers per axis
Wire.requestFrom(address, 6);
if(6<=Wire.available()){
x = Wire.read()<<8; // X msb
x |= Wire.read(); // X lsb
z = Wire.read()<<8; // Z msb
z |= Wire.read(); // Z lsb
y = Wire.read()<<8; // Y msb
y |= Wire.read(); // Y lsb
}
// print out values of each axis
Serial.print("x: ");
Serial.print(x);
Serial.print(" y: ");
Serial.print(y);
Serial.print(" z: ");
Serial.println(z);
delay(250);
}
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